Strikethrough old price and add new

Add this code to the Custom CSS field on the Style tab of your Pricing Table widget’s settings:

/* First table, first column */
.eapps-pricing-table-columns-container-1 .eapps-pricing-table-column-1 .eapps-pricing-table-column-price-value {
text-decoration: line-through;
}

.eapps-pricing-table-columns-container-1 .eapps-pricing-table-column-1 .eapps-pricing-table-column-price-value:after {
content: '50';
display: inline-block;
margin-left: 10px;
}

/ *First table, second column */
.eapps-pricing-table-columns-container-1 .eapps-pricing-table-column-2 .eapps-pricing-table-column-price-value {
text-decoration: line-through;
}

.eapps-pricing-table-columns-container-1 .eapps-pricing-table-column-2 .eapps-pricing-table-column-price-value:after {
content: '75';
display: inline-block;
margin-left: 10px;
}

The new price should be set in the content line:

If you are using the multi-table mode, change the number in the first class to the desired one for the other table (eapps-pricing-table-columns-container-2)